GoKawiilResearchers decode hidden chemistry behind perovskite LED additive, boost efficiency to 37.1%
Scientists studying perovskite light-emitting diodes found that a common additive, 5-aminovaleric acid, reacts in precursor solutions to form two distinct products: a beneficial zwitterion and a harmful lactam byproduct. By controlling which reaction pathway dominates and using the purified beneficial compound directly, they achieved perovskite films with 97.2% photoluminescence quantum yield and devices reaching a record 37.1% external quantum efficiency, with an average of 32.8%.